<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>手写jQuery</title>
</head>
<body>
    
</body>
</html>
<body>
    <div class="test1">你好1
        <div class="child">child1</div>
        <div class="child">child2</div>
        <div class="child">child3</div>
    </div>
    <div class="test">你好2
        <div class="child">child1</div>
        <div class="child">child2</div>
    </div>
    <div class="test">你好3
        <div class="child">child1</div>
    </div>
    <script src="jquery.js"></script>
    <script src="main.js"></script>
</body>
</html>